(1)1.425÷(3.8×0.5)
=1.425÷1.9
=0.75;
(2)2.25÷7.5×(3.2÷2.5)
=2.25÷7.5×1.28
=0.3×1.28
=0.384;
(3)15.6÷24÷0.2
=0.65÷0.2
=3.25;
(4)30.8÷[8×(5.09-4.59)]
=30.8÷[8×0.5]
=30.8÷4
=7.7;
(5)[5.7+(18-3.5)]÷0.05
=[5.7+14.5]÷0.05
=20.2÷0.05
=404;
(6)49.6÷[20-(11.2+2.6)]
=49.6÷[20-13.8]
=49.6÷6.2
=8.